How can we detect volume of a liquid? Or maybe you want to know the quantity of small screw or nut. Will you count it? A good alternative method is to measure the weight of cetain liquid or small parts (if the weight and quantity ratio is linear and consistent). The next question would be, what type of sensor can be used for weight measurement? You are at the right page :) This is 5kg load cell that comes with HX711 amplifier board.

Nonetheless, this module is commonly being used to measure weight. The load cell is a straight bar load cell (sometimes called a strain gauge). It can translate up to 5kg of pressure (force) into an electrical signal. Each load cell is able to measure the electrical resistance that changes in response to, and proportional of, the strain (e.g. pressure or force) applied to the bar. With this gauge you will be able to tell just how heavy an object is, if an object's weight changes over time, or if you simply need to sense the presence of an object by measuring strain or load applied to a surface.

Each straight bar load cell is made from an aluminum-alloy and is capable of reading a capacity of 5kg. These load cells have four strain gauges that are hooked up in a wheatstone bridge formation. The color code on the wiring is as follows:

• Red = E+
• Black = E-
• Green = A+
• White = A-